High-field magnetization and magnetic phase diagram of metamagnetic shape memory alloys Ni50-xCoxMn31.5Ga18.5 ( x=9 and 9.7)

SCRIPTA MATERIALIA

卷:181

Article

Kihara, T.¹  Xu, X.²  Miyake, A.³  Kinoshita, Y.³  Tokunaga, M.³  Adachi, Y.⁴  Kanomata, T.⁵ 

[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi, Japan

[2] Tohoku Univ, Dept Mat Sci, Sendai, Miyagi, Japan

[3] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba, Japan

[4] Yamagata Univ, Grad Sch Sci & Engn, Yonezawa, Yamagata, Japan

[5] Tohoku Gakuin Univ, Res Inst Engn & Technol, Tagajo, Miyagi, Japan

关键词: Heusler alloy;    High magnetic field;    Martensitic transformation;    Hysteresis;   

DOI  :  10.1016/j.scriptamat.2020.02.009

来源: Elsevier

【 摘 要 】

Magnetic phase diagrams of the metamagnetic shape memory alloys Ni50-xCoxMn31.5Ga18.5 (x = 9 and 9.7) were produced from high-field magnetization measurements up to 56 T. For both compounds, magnetic field induced martensitic transformations are observed at various temperatures below 300 K. Hysteresis of the field-induced transformation shows unconventional temperature dependence: it decreases with decreasing temperature after showing a peak. Magnetic susceptibility measurement, microscopy, and X-ray diffraction data suggest a model incorporating the magnetic anisotropy and Zeeman energy in two variants, which qualitatively explains the thermal and the magnetic field history dependence of the hysteresis in these alloys. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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